Combination weighing device with hoppers and discharge chutes having complementary surfaces

ABSTRACT

A combination weighing apparatus includes a plurality of hoppers and a collecting chute. Each of the plurality of hoppers has a main body provided with a first opening and a second opening, and a gate allowed to be opened and closed with respect to the second opening. The main body is provided with a first inner surface and a second inner surface having an intersecting positional relationship to protrude outward with respect to the centerline. The collecting chute has at least a chute portion configured to receive articles discharged from the plurality of hoppers and slide the articles. A portion of the chute portion located below the plurality of hoppers is provided with a first receiving surface and a second receiving surface having an intersecting positional relationship to protrude outward with respect to the centerline.

TECHNICAL FIELD

The present disclosure relates to a combination weighing apparatus.

BACKGROUND ART

In a combination weighing apparatus, articles supplied from the outside (articles having variations in unit mass such as agricultural products, fishery products, and processed foods) are temporarily stored in a plurality of weighing hoppers, a weighing value corresponding to the mass of articles is weighed in each weighing hopper, and the articles are discharged to a collecting chute from a plurality of weighing hoppers selected so that a total value of weighing values corresponds to a target weighing value. The articles discharged to the collecting chute are collected together and discharged from the collecting chute to, for example, a bag making/packaging machine. In this instance, to rapidly and surely carry out packaging of the articles in the bag making/packaging machine, the articles discharged from the plurality of weighing hoppers to the collecting chute need to be discharged from the collecting chute in a short time. Therefore, various shapes of the collecting chute have been devised (for example, see Patent Literature 1).

CITATION LIST Patent Literature

Patent Literature 1: Japanese Unexamined Patent Publication No. 2007-279054

SUMMARY OF INVENTION Technical Problem

An object of the disclosure is to provide a combination weighing apparatus capable of discharging an article discharged from a hopper from a collecting chute in a short time.

Solution to Problem

A combination weighing apparatus according to an aspect of the disclosure includes a plurality of hoppers disposed to surround a centerline parallel to a vertical direction and configured to temporarily store articles supplied from an outside, and a collecting chute configured to discharge the articles discharged from the plurality of hoppers while collecting the articles, in which each of the plurality of hoppers has a main body provided with a first opening through which the articles are input and a second opening through which the articles are discharged, and a gate allowed to be opened and closed with respect to the second opening, the main body is provided with a first inner surface and a second inner surface having an intersecting positional relationship to protrude outward with respect to the centerline, the collecting chute has at least a chute portion configured to receive the articles discharged from the plurality of hoppers and slide the articles, and a portion of the chute portion located below the plurality of hoppers is provided with a first receiving surface and a second receiving surface having an intersecting positional relationship to protrude outward with respect to the centerline, the first receiving surface and the second receiving surface being surfaces corresponding to the first inner surface and the second inner surface, respectively.

In this combination weighing apparatus, the first inner surface and the second inner surface having the intersecting positional relationship to protrude outward with respect to the centerline are provided in the main body of the hopper. Further, the first receiving surface and the second receiving surface having the intersecting positional relationship to protrude outward with respect to the centerline are provided in the portion of the chute portion located below the hoppers. In this way, when the articles discharged from the hoppers reach the first receiving surface and the second receiving surface, a drop speed is made uniform at a center and both sides thereof. Moreover, since the first inner surface and the second inner surface have the intersecting positional relationship to protrude outward with respect to the centerline, the articles are discharged in a state of being collected together from the main body of the weighing hopper. Further, since the first receiving surface and the second receiving surface have the intersecting positional relationship to protrude outward with respect to the centerline, spread of the articles due to dropping is suppressed. Therefore, the articles received by the first receiving surface and the second receiving surface are collected together to slide on an upper stage chute portion. Therefore, according to the combination weighing apparatus, the articles discharged from the hoppers can be discharged from the collecting chute in a short time.

In the combination weighing apparatus according to the aspect of the disclosure, the second opening may be provided in the main body to be positioned on a lower side as the second opening is farther from the centerline, and the gate may be rotatably attached to a portion of an edge of the second opening in the main body on a side of the centerline. In this case, the articles drop in a more collected state along the first inner surface and the second inner surface of the main body.

In the combination weighing apparatus according to the aspect of the disclosure, a first distance between a lower end of the first inner surface and the first receiving surface in a vertical direction may be substantially constant, a second distance between a lower end of the second inner surface and the second receiving surface in the vertical direction may be substantially constant, and the first distance and the second distance may be substantially equal to each other. In this case, when the articles discharged from the hoppers reach the first receiving surface and the second receiving surface, the drop speed becomes substantially equal at the center and both sides thereof.

In the combination weighing apparatus according to the aspect of the disclosure, a plurality of sliding areas may be provided in the chute portion to extend from below the plurality of hoppers to the side of the centerline and be positioned on a lower side as approaching the centerline, each of the plurality of sliding areas may include a sliding surface forming a bottom surface of the sliding area, the first receiving surface connected to the sliding surface on one side of the sliding surface in a horizontal direction when viewed from the side of the centerline, and the second receiving surface connected to the sliding surface on the other side of the sliding surface in the horizontal direction when viewed from the side of the centerline, the sliding surface, the first receiving surface, and the second receiving surface may mutually have an intersecting positional relationship to protrude outward with respect to the centerline, a width of the sliding surface may increase as approaching the centerline, and a width of each of the first receiving surface and the second receiving surface may decrease as approaching the centerline.

In this case, the articles discharged from the hopers are received by the first receiving surface and the second receiving surface of the chute portion. In this instance, since the first receiving surface and the second receiving surface have the intersecting positional relationship to protrude outward with respect to the centerline, spread of the articles due to dropping is suppressed. Further, the articles received by the first receiving surface and the second receiving surface slide on the sliding surface of the chute portion. In this instance, since the width of the sliding surface increases as approaching the centerline, and the width of each of the first receiving surface and the second receiving surface decreases as approaching the centerline, friction, etc. occurring between the articles decreases, and the articles are collected together to smoothly slide on the sliding surface. Therefore, it is possible to discharge the articles discharged from the hoppers from the collecting chute in a short time.

Advantageous Effects of Invention

According to the disclosure, it is possible to provide a combination weighing apparatus capable of discharging an article discharged from a hopper from a collecting chute in a short time.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a configuration diagram of a combination weighing apparatus according to an embodiment.

FIG. 2 is a perspective view of a collecting chute of the combination weighing apparatus of FIG. 1.

FIG. 3 is a diagram illustrating a relationship between a weighing hopper and the collecting chute in the combination weighing apparatus of FIG. 1.

FIG. 4 is a diagram illustrating a relationship between the weighing hopper and the collecting chute in the combination weighing apparatus of FIG. 1.

FIG. 5 is a diagram illustrating a relationship between a weighing hopper and a collecting chute of a comparative example.

FIG. 6 is a diagram illustrating a relationship between the weighing hopper and the collecting chute of the comparative example.

FIG. 7 is a diagram illustrating a relationship between a weighing hopper and a collecting chute of a modification.

FIG. 8 is a cross-sectional view of a partition member of the collecting chute of the modification.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the disclosure will be described in detail with reference to drawings. Incidentally, in each figure, the same or a corresponding part is denoted by the same reference symbol, and duplicate description is omitted.

[Overall Configuration of Combination Weighing Apparatus]

As illustrated in FIG. 1, a combination weighing apparatus 1 includes an charge chute 2, a dispersion feeder 3, a plurality of radiation feeders 4, a plurality of pool hoppers 5, a plurality of weighing hoppers (hoppers) 6, a collecting chute 8, a timing hopper 9, a weighing unit 11, and a controller 20. The combination weighing apparatus 1 weighs articles A (articles having variations in unit mass such as agricultural products, fishery products, and processed foods) supplied by a conveyance conveyor 50 such that the articles A correspond to a target weighing value, and supplies the articles A to a bag making/packaging machine 60. Incidentally, the bag making/packaging machine 60 packages the articles A weighed and supplied by the combination weighing apparatus 1 while molding a film into a bag of a predetermined capacity.

The charge chute 2 is disposed below a conveying end 50 a of the conveyance conveyor 50. The charge chute 2 receives the articles A conveyed from the outside by the conveyance conveyor 50 and dropped from the conveying end 50 a of the conveyance conveyor 50, and discharges the articles A downward.

The dispersion feeder 3 is disposed below the charge chute 2. The dispersion feeder 3 has a conical conveying surface 3 a that widens downward toward an end. The dispersion feeder 3 vibrates the conveying surface 3 a to uniformly convey the articles A discharged from the charge chute 2 to a top of the conveying surface 3 a toward an outer edge of the conveying surface 3 a.

The plurality of radiation feeders 4 is radially arranged along the outer edge of the conveying surface 3 a of the dispersion feeder 3. Each of the radiation feeders 4 has a trough 4 a extending outward from below the outer edge of the conveying surface 3 a. Each radiation feeder 4 conveys the articles A discharged from the outer edge of the conveying surface 3 a toward a distal end of the trough 4 a by vibrating the trough 4 a.

The plurality of pool hoppers 5 is arranged to surround a centerline CL parallel to a vertical direction. Each of the pool hoppers 5 is disposed below the distal end of the trough 4 a of each radiation feeder 4. Each pool hopper 5 has a gate 5 a allowed to be opened and closed with respect to a bottom thereof. Each pool hopper 5 temporarily stores the articles A discharged from the distal end of the corresponding trough 4 a by closing the gate 5 a. Further, each pool hopper 5 discharges the temporarily stored articles A downward by opening the gate 5 a.

The plurality of weighing hoppers 6 is arranged to surround the centerline CL. Each of the weighing hoppers 6 is disposed below the gate 5 a of each pool hopper 5. Each weighing hopper 6 has a main body 61 and a gate 62 allowed to be opened and closed with respect to the bottom of the main body 61. Each weighing hopper 6 temporarily stores the articles A discharged from the corresponding pool hopper 5 in the main body 61 by closing the gate 62. Further, each weighing hopper 6 discharges the articles A temporarily stored in the main body 61 downward by opening the gate 62.

The collecting chute 8 collects the articles A discharged from each weighing hopper 6 at a discharge port 8 a. The discharge port 8 a is positioned on a lower side of the plurality of weighing hoppers 6 and on the centerline CL. The collecting chute 8 has an upper stage chute portion (chute portion) 81 and a lower stage chute portion 82. The upper stage chute portion 81 receives the articles A discharged from each weighing hopper 6 and slides the articles A to the discharge port 8 a side (that is, the centerline CL side and the lower side). The lower stage chute portion 82 is a tubular body of a truncated conical shape tapered downward and has an upper opening 82 a and a lower opening 82 b. The lower stage chute portion 82 discharges the articles A from the discharge port 8 a downward using the lower opening 82 b as the discharge port 8 a.

The timing hopper 9 is disposed below the discharge port 8 a. The timing hopper 9 has a gate 9 a allowed to be opened and closed with respect to a bottom thereof. The timing hopper 9 temporarily stores the articles A discharged from the collecting chute 8 by closing the gate 9 a. Further, the timing hopper 9 discharges the temporarily stored articles A to the bag making/packaging machine 60 by opening the gate 9 a.

The weighing unit 11 is disposed in a case 13 supported on a frame 12. The weighing unit 11 has a plurality of load cells 11 a. Each of the load cells 11 a supports a corresponding weighing hopper 6. When the articles A are temporarily stored in each weighing hopper 6, the weighing unit 11 weighs a weighing value according to the mass of the articles A.

The controller 20 is disposed in the case 13. The controller 20 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), etc. The controller 20 controls an operation of each unit of the combination weighing apparatus 1 such as a conveying operation of the dispersion feeder 3 and the radiation feeder 4, an opening/closing operation of the gate 5 a of each pool hopper 5, an opening/closing operation of the gate 62 of each weighing hopper 6, and an opening/closing operation of the gate 9 a of the timing hopper 9. Incidentally, the controller 20 is connected to the bag making/packaging machine 60 such that communication is allowed.

The controller 20 stores the weighing value weighed by the weighing unit 11 and the weighing hopper 6 that stores the articles A corresponding to the weighing value in association with each other. The controller 20 selects a combination of weighing values from a plurality of weighting values weighed by the weighing unit 11 and associated with the respective weighing hoppers 6 so that a total value becomes a target weighing value. More specifically, the controller 20 selects a combination of weighing values from a plurality of weighting values output by the weighing unit 11 so that a total value falls within a predetermined range having the target weighing value as a lower limit. Then, the controller 20 causes the weighing hopper 6 corresponding to the combination to discharge the articles A.

Incidentally, the charge chute 2, the dispersion feeder 3, the plurality of radiation feeders 4, the plurality of pool hoppers 5 and the plurality of weighing hoppers 6 are directly or indirectly supported by the case 13. The collecting chute 8 and the timing hopper 9 are directly or indirectly supported on the frame 12.

[Configuration of Upper Stage Chute Portion of Collecting Chute]

As illustrated in FIG. 2, in the collecting chute 8, the upper stage chute portion 81 has a plurality of sliding areas R. Each of the sliding areas R extends from below each weighing hopper 6 to the centerline CL side so as to be positioned on the lower side as approaching the centerline CL (see FIG. 1). Each sliding area R is composed of a partition member 83 formed by bending a metal plate. More specifically, each sliding area R includes a sliding surface 83 a, a first receiving surface 83 b, a second receiving surface 83 c, a first side surface 83 d, and a second side surface 83 e which are inner surfaces of each partitioning member 83. Incidentally, in FIG. 2, illustration of a part of the partition member 83 is omitted.

The sliding surface 83 a forms a bottom surface of the sliding area R and extends from below the weighing hopper 6 to an outer edge of the opening 82 a of the lower stage chute portion 82. The sliding surface 83 a is a flat surface, and has a triangular shape (an isosceles triangle shape in which a base is positioned on the centerline CL side) in which one side is positioned on the centerline CL side and one vertex is positioned on an opposite side from the centerline CL side).

The first receiving surface 83 b is directly connected to the sliding surface 83 a on one side of the sliding surface 83 a in a horizontal direction when viewed from the centerline CL side and extends from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82. The first receiving surface 83 b is a flat surface, and has a triangular shape in which one vertex is positioned on the centerline CL side and one side is positioned on an opposite side from the centerline CL side. Incidentally, “one surface is directly connected to the other surface” means that substantially no other surface is interposed between one surface and the other surface, and includes a case in which a chamfered surface, etc. is interposed between one surface and the other surface in addition to a case in which one surface and the other surface are directly connected to each other (hereinafter the same).

The second receiving surface 83 e is directly connected to the sliding surface 83 a on the other side of the sliding surface 83 a in the horizontal direction when viewed from the centerline CL side and extends from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82. The second receiving surface 83 c is a flat surface, and has a triangular shape in which one vertex is positioned on the centerline CL side and one side is positioned on an opposite side from the centerline CL side.

A width of the sliding surface 83 a (width in the horizontal direction) increases as approaching the centerline CL. A width of each of the first receiving surface 83 b and the second receiving surface 83 c (width in the horizontal direction) decreases as approaching the centerline CL. The sliding surface 83 a and the first receiving surface 83 b have an intersecting positional relationship to protrude outward with respect to the centerline CL (to form a valley fold). Similarly, the sliding surface 83 a and the second receiving surface 83 c have the intersecting positional relationship to protrude outward with respect to the centerline CL (to form a valley fold). Further, the first receiving surface 83 b and the second receiving surface 83 c also have the intersecting positional relationship to protrude outward with respect to the centerline CL (to form a valley fold) (even though the first receiving surface 83 b and the second receiving surface 83 c do not directly intersect each other, surfaces including the first receiving surface 83 b and the second receiving surface 83 c intersect each other to protrude outward with respect to the centerline CL). In this way, the sliding surface 83 a, the first receiving surface 83 b, and the second receiving surface 83 c mutually have the intersecting positional relationship to protrude outward with respect to the centerline CL.

The first side surface 83 d is directly connected to the first receiving surface 83 b on one side of the first receiving surface 83 b in the horizontal direction when viewed from the centerline CL side, and extends from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82. The first side surface 83 d is a flat surface and has a rectangular shape. The second side surface 83 e is directly connected to the second receiving surface 83 c on the other side of the second receiving surface 83 c in the horizontal direction when viewed from the centerline CL side, and extends from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82. The second side surface 83 e is a flat surface and has a rectangular shape. The first side surface 83 d and the second side surface 83 e face each other through the sliding area R.

[Relationship Between Weighing Hopper and Collecting Chute]

As illustrated in FIG. 3, the main body 61 of the weighing hopper 6 is a pentagonal pillar-shaped tubular body, and has an upper opening (first opening) 61 a and a lower opening (second opening) 61 b. The upper opening 61 a into which the articles A are put is provided substantially horizontally in the main body 61. The lower opening 61 b from which the articles A are discharged is provided in the main body 61 so as to be positioned on the lower side as the lower opening 61 b is farther from the centerline CL. The gate 62 is rotatably attached to a portion of an edge of the lower opening 61 b in the main body 61 on the centerline CL side, and is allowed to be opened and closed with respect to the lower opening 61 b.

As illustrated in FIG. 4, the main body 61 is provided with a first inner surface 61 c and a second inner surface 61 d having the intersecting positional relationship to protrude outward with respect to the centerline CL (to form a valley fold). An upper end of the first receiving surface 83 b of the partition member 83 is positioned below a lower end of the first inner surface 61 c. Similarly, an upper end of the second receiving surface 83 c of the partition member 83 is positioned below a lower end of the second inner surface 61 d. In this way, the first receiving surface 83 b and the second receiving surface 83 c of each partition member 83, which are surfaces corresponding to the first inner surface 61 c and the second inner surface 61 d, respectively, are disposed in a portion positioned below each weighing hopper 6 in the upper stage chute portion 81.

A first distance d1 between a lower end of the first inner surface 61 c and the first receiving surface 83 b in the vertical direction is substantially constant. A second distance d2 between a lower end of the second inner surface 61 d and the second receiving surface 83 c in the vertical direction is substantially constant. The first distance d1 and the second distance d2 are substantially equal to each other.

Action and Effect

In the combination weighing apparatus 1, the first inner surface 61 c and the second inner surface 61 d having the intersecting positional relationship to protrude outward with respect to the centerline CL are provided in the main body 61 of the weighing hopper 6. Further, the first receiving surface 83 b and the second receiving surface 83 c having the intersecting positional relationship to protrude outward with respect to the centerline CL are provided in a portion of the upper stage chute portion 81 below the weighing hopper 6. In this way, when the articles A discharged from the weighing hopper 6 reach the first receiving surface 83 b and the second receiving surface 83 c, a drop speed is made uniform at a center and both sides thereof. Moreover, since the first inner surface 61 c and the second inner surface 61 d have the intersecting positional relationship to protrude outward with respect to the centerline CL, the articles A are discharged in a state of being collected together from the main body 61 of the weighing hopper 6. Further, since the first receiving surface 83 b and the second receiving surface 83 c have the intersecting positional relationship to protrude outward with respect to the centerline CL, spread of the articles A due to dropping is suppressed. Therefore, the articles A received by the first receiving surface 83 b and the second receiving surface 83 c are collected together (see a two-dot chain line of FIG. 4) to slide on the upper stage chute portion 81 toward the discharge port 8 a side of the lower stage chute portion 82. Therefore, according to the combination weighing apparatus 1, the articles A discharged from the weighing hopper 6 can be discharged from the collecting chute 8 in a short time.

In addition, in the combination weighing apparatus 1, in each weighing hopper 6, the opening 61 b is provided in the main body 61 so as to be positioned on the lower side as the opening 61 b is farther from the centerline CL, and the gate 62 is rotatably attached to the portion of the edge of the opening 61 b in the main body 61 on the centerline CL side. In this way, the articles A drops in a more collected state along the first inner surface 61 c and the second inner surface 61 d of the main body 61.

In addition, in the combination weighing apparatus 1, the first distance d1 between the lower end of the first inner surface 61 c and the first receiving surface 83 b in the vertical direction is substantially constant, the second distance d2 between the lower end of the second inner surface 61 d and the second receiving surface 83 c in the vertical direction is substantially constant, and the first distance d1 and the second distance d2 are substantially equal to each other. In this way, when the articles A discharged from the weighing hopper 6 reach the first receiving surface 83 b and the second receiving surface 83 c, the drop speed becomes substantially equal at the center and both sides thereof.

As a comparative example, when a main body 61 of the weighing hopper 6A is a square pillar-shaped tubular body as illustrated in FIG. 5, and an inner surface 61 f facing the centerline CL side is one plane as illustrated in FIG. 6, the articles A received by the first receiving surface 83 b and the second receiving surface 83 c vertically extend when compared to a case indicated by the two-dot chain line in FIG. 4 (see a two-dot chain line of FIG. 6). This is because each of a first distance d1 between a lower end of the inner surface 61 f and the first receiving surface 83 b in the vertical direction and a second distance d2 between the lower end of the inner surface 61 f and the second receiving surface 83 c in the vertical direction increases toward a center, and a drop speed increases toward the center when the articles A discharged from the weighing hopper 6 reach the first receiving surface 83 b and the second receiving surface 83 c.

In addition, in the combination weighing apparatus 1, the articles A discharged from the weighing hopper 6 are received by the first receiving surface 83 b and the second receiving surface 83 c of the upper stage chute portion 81. In this instance, since the first receiving surface 83 b and the second receiving surface 83 c have the intersecting positional relationship to protrude outward with respect to the centerline CL, spread of the articles A due to dropping is suppressed. Further, the articles A received by the first receiving surface 83 b and the second receiving surface 83 c slide on the sliding surface 83 a of the upper stage chute portion 81 toward the discharge port 8 a side of the lower stage chute portion 82. In this instance, since the width of the sliding surface 83 a increases as approaching the centerline CL, and the width of each of the first receiving surface 83 b and the second receiving surface 83 c decreases as approaching the centerline CL, friction, etc. occurring between the articles A decreases, and the articles A are collected together to smoothly slide on the sliding surface 83 a. Moreover, since spread of the articles A due to dropping is suppressed, friction due to contact between the articles A and the first side surface 83 d and the second side surface 83 e is reduced, and the articles A are collected together to smoothly slide on the sliding surface 83 a. Therefore, according to the combination weighing apparatus 1, it is possible to discharge the articles A discharged from the weighing hopper 6 from the collecting chute 8 in a short time.

In addition, in the combination weighing apparatus 1, each of the sliding surface 83 a, the first receiving surface 83 b and the second receiving surface 83 c is a flat surface, and each of the first receiving surface 83 b and the second receiving surface 83 c is directly connected to the sliding surface 83 a. In this way, for example, the sliding surface 83 a, the first receiving surface 83 b, and the second receiving surface 83 c can be easily configured by bending a plate material.

In addition, in the combination weighing apparatus 1, the sliding surface 83 a has the triangular shape in which one side is positioned on the centerline CL side and one vertex is positioned on the opposite side from the centerline CL side, and each of the first receiving surface 83 b and the second receiving surface 83 c has the triangular shape in which one vertex is positioned on the centerline CL side and one side is positioned on the opposite side from the centerline CL side. In this way, it is possible to appropriately implement a configuration in which the width of the sliding surface 83 a increases as approaching the centerline CL and the width of each of the first receiving surface 83 b and the second receiving surface 83 c decreases as approaching the centerline CL.

[Modification]

Even though the embodiment of the disclosure has been described above, the combination weighing apparatus of the disclosure is not limited to the above-described embodiment. For example, in the main body 61 of the weighing hopper 6, the first inner surface 61 c and the second inner surface 61 d may not be directly connected to each other. As an example, as illustrated in FIG. 7(a), the first inner surface 61 c and the second inner surface 61 d may be indirectly connected to each other through another surface 61 e. Similarly, in the partition member 83, the first receiving surface 83 b and the second receiving surface 83 c may be directly connected to each other. As an example, as illustrated in FIG. 7(a), the first receiving surface 83 b and the second receiving surface 83 c may be indirectly connected to each other through another surface 83 f.

In addition, in the main body 61 of the weighing hopper 6, the first inner surface 61 c and the second inner surface 61 d may not be the flat surfaces. As an example, as illustrated in FIG. 7(b), the first inner surface 61 c and the second inner surface 61 d may be curved surfaces. Similarly, in the partition member 83, the first receiving surface 83 b and the second receiving surface 83 c may not be the flat surfaces. As an example, as illustrated in FIG. 7(b), the first receiving surface 83 b and the second receiving surface 83 c may be curved surfaces.

In addition, when the main body 61 of the weighing hopper 6 is provided with the first inner surface 61 c and the second inner, surface 61 d having the intersecting positional relationship to protrude outward with respect to the centerline CL, and a portion of the upper stage chute portion 81 located below each weighing hopper 6 is provided with the first receiving surface 83 b and the second receiving surface 83 c having the intersecting positional relationship to protrude outward with respect to the centerline CL, each of the first distance d1 and the second distance d2 may not be substantially constant, and the first distance d1 and the second distance d2 may not be substantially equal to each other.

In addition, as illustrated in FIG. 8(a), the sliding surface 83 a may not be the flat surface and may be a curved surface. In addition, as illustrated in FIG. 8(b), each of the first receiving surface 83 b and the second receiving surface 83 c may not be the flat surface and may be a curved surface. In addition, as illustrated in FIG. 8(c), the sliding surface 83 a may not be the one plane and may include a plurality of flat surfaces or a plurality of curved surfaces.

In addition, the shape of the sliding surface 83 a is not limited to the triangular shape in which one side is positioned on the centerline CL side and one vertex is positioned on the opposite side from the centerline CL side. For example, it is possible to adopt a trapezoidal shape in which a long base is located on the centerline CL side and a short base is located on the opposite side from the centerline CL side, etc. as long as the width of the sliding surface 83 a increases as approaching the centerline CL. In addition, the shape of each of the first receiving surface 83 b and the second receiving surface 83 c is not limited to the triangular shape in which one vertex is positioned on the centerline CL side and one side is positioned on the opposite side from the centerline CL side. For example, it is possible to adopt a trapezoidal shape in which a short base is located on the centerline CL side and a long base is located on the opposite side from the centerline CL side, etc. as long as the width of each of the first receiving surface 83 b and the second receiving surface 83 c decreases as approaching the centerline CL.

In addition, the sliding surface 83 a is not limited to a surface extending from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82, and may be a surface extending from a middle of the sliding area R to the outer edge of the opening 82 a of the lower stage chute portion 82. That is, the width of the sliding surface 83 a may be zero below the weighing hopper 6. In addition, each of the first receiving surface 83 b and the second receiving surface 83 c is not limited to a surface extending from below the weighing hopper 6 to the outer edge of the opening 82 a of the lower stage chute portion 82, and may be a surface extending from below the weighing hopper 6 to the middle of the sliding area R. That is, the width of each of the first receiving surface 83 b and the second receiving surface 83 c may be zero at the outer edge of the opening 82 a of the lower stage chute portion 82.

As described above, the shape of the sliding surface 83 a may be a shape in which the width of the sliding surface 83 a increases as approaching the centerline CL within a preset upper limit as a limit. In addition, the shape of each of the first receiving surface 83 b and the second receiving surface 83 c may be a shape in which the width of each of the first receiving surface 83 b and the second receiving surface 83 c decreases as approaching the centerline CL within a preset lower limit as a limit. In these cases, it is possible to appropriately implement a configuration in which the width of the sliding surface 83 a increases as approaching the centerline CL and the width of each of the first receiving surface 83 b and the second receiving surface 83 c decreases as approaching the centerline CL.

In addition, in the partition member 83, each of the first receiving surface 83 b and the second receiving surface 83 c may not be directly connected to the sliding surface 83 a. That is, the first receiving surface 83 b and the second receiving surface 83 c may be indirectly connected to the sliding surface 83 a through another surface.

In addition, the combination weighing apparatus 1 may not include the timing hopper 9. The configuration of the combination weighing apparatus of the disclosure capable of discharging the articles discharged from the hopper in a state of being collected together from the collecting chute is particularly effective when the combination weighing apparatus 1 does not include the timing hopper 9.

In addition, the collecting chute 8 may not have the lower stage chute portion 82. For example, when the bag making/packaging machine 60 has a configuration corresponding to the lower stage chute portion 82, the need for the collecting chute 8 of the combination weighing apparatus 1 to have the lower stage chute portion 82 is low.

In addition, in the above-described embodiment, the weighing hopper 6 and the sliding area R (partition member 83) correspond to each other on a one-to-one basis. However, for example, one sliding area R (partition member 83) may correspond to a plurality of weighing hoppers 6.

REFERENCE SIGNS LIST

1: combination weighing apparatus, 6: weighing hopper (hopper), 8: collecting chute, 61: main body, 61 a: opening (first opening), 61 b: opening (second opening), 61 c: first inner surface, 61 d: second inner surface, 62: gate, 81: upper stage chute portion (chute portion), 83 a: sliding surface, 83 b: first receiving surface, 83 c: second receiving surface, A: articles, CL: centerline, R: sliding area. 

The invention claimed is:
 1. A combination weighing apparatus comprising: a plurality of hoppers disposed to surround a centerline parallel to a vertical direction and configured to temporarily store articles supplied from an outside; and a collecting chute configured to discharge the articles discharged from the plurality of hoppers while collecting the articles, wherein each of the plurality of hoppers has a main body provided with a first opening through which the articles are input and a second opening through which the articles are discharged, and a gate allowed to be opened and closed with respect to the second opening, the main body is provided with a first inner surface and a second inner surface having an intersecting positional relationship to protrude outward with respect to the centerline, the collecting chute has at least a chute portion configured to receive the articles discharged from the plurality of hoppers and slide the articles, and a portion of the chute portion located below the plurality of hoppers is provided with a first receiving surface and a second receiving surface having an intersecting positional relationship to protrude outward with respect to the centerline, the first receiving surface and the second receiving surface being surfaces complementary to the first inner surface and the second inner surface, respectively.
 2. The combination weighing apparatus according to claim 1, wherein the second opening is provided in the main body to be positioned on a lower side as the second opening is farther from the centerline, and the gate is rotatably attached to a portion of an edge of the second opening in the main body on a side of the centerline.
 3. The combination weighing apparatus according to claim 1, wherein a first distance between a lower end of the first inner surface and the first receiving surface in a vertical direction is substantially constant, a second distance between a lower end of the second inner surface and the second receiving surface in the vertical direction is substantially constant, and the first distance and the second distance are substantially equal to each other.
 4. The combination weighing apparatus according to claim 1, wherein a plurality of sliding areas is provided in the chute portion to extend from below the plurality of hoppers to the side of the centerline and be positioned on a lower side as approaching the centerline, each of the plurality of sliding areas includes a sliding surface forming a bottom surface of the sliding area, the first receiving surface connected to the sliding surface on one side of the sliding surface in a horizontal direction when viewed from the side of the centerline, and the second receiving surface connected to the sliding surface on the other side of the sliding surface in the horizontal direction when viewed from the side of the centerline, the sliding surface, the first receiving surface, and the second receiving surface mutually have an intersecting positional relationship to protrude outward with respect to the centerline, a width of the sliding surface increases as approaching the centerline, and a width of each of the first receiving surface and the second receiving surface decreases as approaching the centerline. 